By contrast, we haven’t heard about any issues regarding Rian Johnson’s time making Star Wars: The Last Jedi.
At this point, it makes a lot of sense that Lucasfilm might look to Rian Johnson simply because he’s one of the few directors who seems to function well within the Star Wars machine.
If the studio goes with somebody else new, it’s taking the risk it could end up with the same problem.
Everything there seems to have been going smoothly, and after separating with two directors on different projects, Lucasfilm could probably use the confidence of knowing the replacement will work out.